The Ontario campaign trail will take the three party leaders to five cities today.

Liberal Premier Kathleen Wynne is scheduled to speak in Toronto's Little Italy neighbourhood before appearing with students at a French-language elementary school and meeting constituents in Mississauga.

The plan is a cornerstone of Wynne's campaign and a bone of contention between her and the Harper Conservatives.

Horwath unveiled her party's campaign platform. It outlines a plan to raise the corporate tax rate and offer financial help to hydro users, family caregivers and students.

Progressive Conservative Leader Tim Hudak spent the day campaigning in Ottawa, where he said a judicial inquiry is needed for the Liberal government's gas plants scandal.

What would you ask the leaders during the June 3 leaders debate? Email us at ontariodebate@cbc.ca and you may be chosen to ask your question on-camera during the televised broadcast. Please include your contact information and a bit of information about yourself.